Crossword Genius

Sample collected by Ancestry.com (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Bodily substance that stores genetic information - police use it to identify" , "Deoxyribonucleic acid (abbreviation)" , "Genetic profile" , "Initially, it stores genetic information" , "It carries genetic information" .)

I've seen this clue in The New York Times.
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